Saw.



F. A. ONSTINB.

SAW.

nrucumx rum) um 6, 191a.

1,129,595. Patented Feb. 23, 1915.

INVEN'I'OR z W MMW- M IIIE mums PETERS (27.. PNOTO-LHHQ, WASHINGTON. D. C.

FREDERICK A. ONSTINE, 0F

CLEVELAND, OHIO.

SAW.

Specification of Letters Patent.

Patented Feb. 23, 1915.

Application filed January 6, 1913. Serial No. 740,273.

To all whom it may concern:

Be it known that I, FREDERICK A. ON- STINE, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented new and useful Improvements in Saws, of which the following is a specification.

My invention relates to saws and has particular reference to saws having means whereby the blades may be easily and quickly removed and replaced, and whereby they may be held securely in place.

My invention also relates to means for adjusting the tension on the blades and for compensating for slight variations in the length of the same.

Further objects will appear hereinafter.

Referring to the accompanying drawings, Figure 1 is a side elevation of a saw to which my invention has been applied; Fig. 2, a vertical section of a portion of the saw, showing the internal structure of the portions in which my invention particularly resides; Fig. 3, a perspective view of the lever for locking the blade to the saw and giving the latter the desired tension; Fig. 4, an en view of the said lever looking toward the left at Fig. 1; Fig. 5, a bottom view of the said lever; and Fig. 6, a perspective view of the adjustable wedge carried by the lever.

On the drawings, the frame of the saw is composed of metal and has the back 1, the front arm 2, and the rear arm 3. The arms 2 and 3 are provided with slots to receive the saw-blade 41, the slot in the rear arm being marked 5. The front edge of the arm has the slot 6 to receive the transverse pin 7 secured to the blade 1. The rear edge of the arm 3 has the rounded notch 8 near the end thereof, having the projection or fulcrum 8 for the lever 9.

1C is the handle secured to the frame at or near the junction of the back 1 and the rear arm 3.

The body of the lever 9 is a block or piece of metal having a kerf or slot 11 which is open at its under side and extends upwardly a sufficient distance to accommodate the rear end of the blade 4. The front edge of the lever is channeled or grooved, as at 12, from the top downwardly, lower end of the groove 12 the forwardly 0111 ed projections 13, one on each side of the slot 11, in which they obviously lie when the lever is rocked from the position shown in Fig. 2, to that shown in Fig. 1. Prefthere being near the erably the projections 13 are slightly within the front edges of the flanges or side walls 14: which define the sides of the slot and embrace the sides of the arm 3 when the lever is in the position shown in Fig. 1., and in the dotted position shown in Fig. 3. Preferably the projections do not quite reaeh'the lower end of the groove 12, thereby leaving a shoulder or depression 15 at each side of the slot 11 to receive the fulcrum 8 at each side of the said slot. The lever 9 has at its rear upper corner the upwardly and forwardly curved operating arm 16. The rear edge of the lever has the open-ended slot 17 to receive the transversejndltl secured in the rear end of the saw ha e.

The rear 130113101101 the slot 11 is widened at each side, as shown at 19 to provide a space for the vertlcal wedge 20, having a vertical back in engagement with the front wall of the slot 19. The rear edge of the wedge 20 is inclined upwardly and toward the front wall of the slot 19. The wedge has the slot 21 in line with the slot 11 toreceive the blade 4. The upper end of the wedge has the screw threaded stem 22 which extends up through the top wall of the slot 19 and is provided with the nut 23, bearing on the top of the body of the lever 9.

The front end of the blade 4 is inserted in the arm 2 with the pin 7 in the slot 6. The lever 9 is placed as in Fig. 2 with the fulcrum 8 preferably in the notch 15, and the pin 18 in the slot 17 and against the rear edge of the wedge 20. The lever is then moved to the dotted position (Fig.2) or theposition'shownon Fig.1, causing the arms 2 and 3 to be slightly sprung toward each other and the pin 18 to pass the dead center with respect to the fulcrum 8. The strain put on the arms 2 and 3 is exerted, when the lever is in the position shown on Fig. 1, to hold the lever firmly in contact with the rear edge of the arm 3 and to keep the blade tightly stretched. The blade may be easily and quickly removed by inserting venti'on the wedge is raised, the pin 18 is seated farther to the rear in the slot 17 so that the tension on the blade is increased, or a slightly longer blade may be used.

The lever 9 is preferably thicker than the front arm 2, owing to the insertion of the wedge in the lever. This permits the use of a longer cross-pin at the rear end of the blade than at the forward end without the ends of the pin extending beyond the faces of the lever. The on one'endof the to get the blade teeth of the blade re'ction.

While I have shown and described my in- I in detail, I do not desir'e to be restricted to the combinations and details shown and described, as the same can be varied considerably within the scope of the appended claims.

I claim 1. Ina saw, a U-frame, a saw blade connected at one end to the front arm thereof, a lever pivotally connected to the other end of the bladeand to the rear arm of the frame, and means carried by the lever and movable relatively to the lever and transversely of the blade and engaging with the pivotal connection between the lever and the blade for adjusting the tension of the blade. i

2. In a saw, a U-frame, a saw blade connected at one end to the front'arm thereof, a lever for connecting the other end of the blade to the rear arm of the frame, and a wedge movable transversely of the blade carried by the lever for adjusting the connection thereof with the saw blade.

3. In a saw, a u frarne, a saw blade connected at one end to the front arm thereof and provided at the other end with a cross pin, a lever supported by the rear arm of the frame, and a Wedge carried by the lever and adjustable transversely of the blade for enprovisi'on or a longer pin saw blade'enables it easy into the frame with the pointing in the proper di-.

gaging the cross pin sion of the saw blade.

4L. In a saw, a U-frame, a saw blade connected at one end to the front arm thereof and extending at the other end to the rear of the rear arm of the frame, a tension device for the blade operating between the said rear arm and the rear end of the blade, and a Wedge movable transversely of the blade carried by the tension device for adjusting the tension of the blade.

5 In a saw, a U-frame, a saw blade connected to one end thereof, a lever cooperating with the other end of the frame and the saw blade to connect the latter to the frame, and a wedge carried by the lever and adjustable therein transversely of the blade to vary the tension of the saw blade.

In a saw, a U-frame, a saw blade connected at one end to the front arm thereof and having across-pin at its rear end, a lever normally engaging the rear edge of the rear arm of the frame, the lever having a slot in its rear edge, a wedge lying across the slot and having its rear edge engaging the cross-pin, and means for adjusting the wedge longitudinally to vary the position of the cross-pin in the slot.

In a saw, a saw blade, and a lever to tension the same, the lever having a rear groove, a slot for the saw blade extending from the base of the groove to the rear of the lever, a slotted wedge movable cross-wise blade and seated in the widened and adjusting the tenof the saw rear part of the slot in thelever, a slot in the rear edge of the lever, means for adjusting the Wedge longitudinally, and a cross-pin on the saw blade in engagement with the rear edge of the wedge.

Signed at Cleveland, Ohio this 21st day of December, A. D. 1912.

FREDERICK A. ONSTINE. Witnesses ALLIoE V. LONG, F. B. Lone.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents- Washington, D. C. 

